update according to PR comments

packages/node_modules/@node-red/runtime/lib/flows/Flow.js

@@ -20,6 +20,7 @@ const events = require("@node-red/util").events;
 var flowUtil = require("./util");
 const context = require('../nodes/context');
 const hooks = require("@node-red/util").hooks;
+const credentials = require("../nodes/credentials");
 
 var Subflow;
 var Log;
@@ -422,11 +423,22 @@ class Flow {
      */
     getFlowSetting(name) {
         const flow = this.flow; 
+        if (flow.credentials === undefined) {
+            flow.credentials = credentials.get(flow.id) || {};
+        }
         if (flow.env) {
             if (!name.startsWith("$parent.")) {
                 if (!flow._env) {
                     const envs = flow.env;
-                    const entries = envs.map((env) => [env.name, env]);
+                    const entries = envs.map((env) => {
+                        if (env.type === "cred") {
+                            const cred = flow.credentials;
+                            if (cred.hasOwnProperty(env.name)) {
+                                env.value = cred[env.name];
+                            }
+                        }
+                        return [env.name, env]
+                    });
                     flow._env = Object.fromEntries(entries);
                 }
                 const env = flow._env[name];
@@ -466,6 +478,82 @@ class Flow {
         return null;
     }
 
+    /*!
+     * Get value of environment variable defined in group node.
+     * @param {String} group - group node
+     * @param {String} name - name of variable
+     * @return {Object} object containing the value in val property or null if not defined
+     */
+    getGroupEnvSetting(node, group, name) {
+        if (group) {
+            if (group.credentials === undefined) {
+                group.credentials = credentials.get(group.id) || {};
+            }
+            if (!name.startsWith("$parent.")) {
+                if (group.env) {
+                    if (!group._env) {
+                        const envs = group.env;
+                        const entries = envs.map((env) => {
+                            if (env.type === "cred") {
+                                const cred = group.credentials;
+                                if (cred.hasOwnProperty(env.name)) {
+                                    env.value = cred[env.name];
+                                }
+                            }
+                            return [env.name, env];
+                            
+                            return [env.name, env];
+                        });
+                        group._env = Object.fromEntries(entries);
+                    }
+                    const env = group._env[name];
+                    if (env) {
+                        let value = env.value;
+                        const type = env.type;
+                        if ((type !== "env") ||
+                            (value !== name)) {
+                            if (type === "env") {
+                                value = value.replace(new RegExp("\\${"+name+"}","g"),"${$parent."+name+"}");
+                            }
+                            if (type === "bool") {
+                                const val
+                                      = ((value === "true") ||
+                                         (value === true));
+                                return {
+                                    val: val
+                                };
+                            }
+                            if (type === "cred") {
+                                return {
+                                    val: value
+                                };
+                            }
+                            try {
+                                var val = redUtil.evaluateNodeProperty(value, type, node, null, null);
+                                return {
+                                    val: val
+                                };
+                            }
+                            catch (e) {
+                                this.error(e);
+                                return null;
+                            }
+                        }
+                    }
+                }
+            }
+            else {
+                name = name.substring(8);
+            }
+            if (group.g) {
+                const parent = this.getGroupNode(group.g);
+                return this.getGroupEnvSetting(node, parent, name);
+            }
+        }
+        return null;
+    }
+
+
     /**
      * Get a flow setting value. This currently automatically defers to the parent
      * flow which, as defined in ./index.js returns `process.env[key]`.